No. There is no point in him retiring before the start of the bloody season FFS. He'll probably be able to play 3-6 games for the season, so if they just keep him in cotton wool until round 15 and then get him to build up a fitness base so he's ok for the finals I'll be happy.
It seems that he is incapable of putting together a whole season but while he's on the list we may as well just try to have him in the team when he is most needed.
I'd be very disappointed if he didn't do the right thing by the club and retire at the end of this year though. He can't go through rehab without injuring himself so I don't want to end up losing someone like Gram/X.Clarke/Montagna due to his salary.
Looking back the 5-year deal is a horrible decision, but at the time GT and Hamill were praised for ensuring stability and loyalty at the club, while securing our best player until the end of his career.